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Chapter 1: The Living World
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Chapter 5: Morphology of Flowering Plants
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Chapter 11: Transport in Plants
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Q1
In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?
Q2
Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?
Q3
How can plants be grown under limited water supply without compromising on metabolic activities?
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Chapter 12: Mineral Nutrition
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Chapter 13: Photosynthesis in Higher Plants
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Chapter 14: Respiration in Plants
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Chapter 15: Plant Growth and Development
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Chapter 16: Digestion and Absorption
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Chapter 17: Breathing and Exchange of Gases
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Chapter 18: Body Fluids and Circulation
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Question
Medium
Solving time: 3 mins
Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?
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Various types of ions, minerals and organic compound are transported in plants in various modes, e.g.,
(i) Food substances synthesised in leaves are translocated downward towards root and stem.
(ii) Similarly food is translocated upwards to the developing leaves, buds and fruits.
(iii) Radial transport of food occurs across the stem from the cells of pith, from cortex etc, towards epidermis.
(iv) lons and minerals are transported upwards through xylem.
Since, diffusion is a slow process and allows movement of molecules for short distances only, it cannot filled and alone carry out the above mentioned movements of organic and inorganic substances. Therefore, a need arises for special long distance transport systems that permits and move substances at a much faster rate, i.e., mass or bulk flow system through conducting tissues (translocation).
(i) Food substances synthesised in leaves are translocated downward towards root and stem.
(ii) Similarly food is translocated upwards to the developing leaves, buds and fruits.
(iii) Radial transport of food occurs across the stem from the cells of pith, from cortex etc, towards epidermis.
(iv) lons and minerals are transported upwards through xylem.
Since, diffusion is a slow process and allows movement of molecules for short distances only, it cannot filled and alone carry out the above mentioned movements of organic and inorganic substances. Therefore, a need arises for special long distance transport systems that permits and move substances at a much faster rate, i.e., mass or bulk flow system through conducting tissues (translocation).
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In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?
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(i) It creates transpiration pull for absorption and transport of plants.
(ii) It supplies water for photosynthesis.
(iii) It transports minerals from the soil to all parts of the plants.
(iv) It heats leaf surfaces, sometimes 10 to 15 degrees.
(v) It maintains the shape and structure of the plants by keeping cells turgid.
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| Question Text | Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone? |
| Topic | Transport in Plants |
| Subject | Biology |
| Class | Class 11 |
| Answer Type | Text solution:1 |
| Upvotes | 145 |
